Question

Draw a ray diagram to illustrate the formation of an enlarged and upright image of an object by a lens. Name the lens used. Where should the object be placed relative to the lens? Will the image be real or virtual? Name a device where this action of lens is used.

Answer 1

The ray diagram showing the formation of an enlarged and upright image of an object by a lens is shown in the figure alongside. For the object AB, the image is A’B’. The lens used is convex (converging).
The object should be placed between optical centre O and focus F of the lens, in front of it.
The image is virtual.
This action of lens is used in a simple magnifier (or a reading glass).